Magnetic material and vanadium pentoxide bonding means therefor



Patented July 6, 1937 MAGNETIC MATERIAL AND VANADIUM.

PENTOXIDE BONDING MEANS THEREFOR Samuel Ruben, New Rochelle, N. Y.

No Drawing.

iclaims.

This invention relates to pressed and bonded granular materials, useful in the production of magnets. I

An object of the invention is the provision of 5 an improved bonding agent for magnets. of the pressed type. Another object is to provide a means wheregy rzidagnets may be simply and economically prouc Further objects will be apparent from the disclosure.

It is desirable, in the provision of permanent magnet materiaL-to have a bonding agent which will adhere as a very thin surface between the particles of the magnetic material and will allow the pressed and bonded material to be heat treated so as to provide maximum magnetic eiiects.

I have found that vanadium pentoxide is espe- 20 cially suitable for these purposes. It allows the production of a pressed magnet of the permanent type with materials ordinarily too brittle for practical use.

In the preparation oi the material, the varimagnet, for instance, nickel, aluminum, cobalt and iron. are processed into very finely divided granules and milled with powdered vanadium pentoxide in the proportion or about ten (10%) 30 percent by weight the magnetic material. In

order to aiiord better contacting during the milling.asmallamountoiwatercanbeadded. 'lhe mixed mass is then pressed and heated to ap- Application March s, 1936, Serial No. 67,491

proximately 100 C. at which temperature the oxide flows and integrally combines with the surface of the granules, at the same time binding them together. When cooled, the material is a dense, tough structure with minimum gaps between the metal granules. It can be repeatedly heated or quenched without affecting its mechanical strength. For a typical mixture, I may use twenty (20%) percent nickel, twenty percent aluminum, ten (10%) percent cobalt and fifty (50%) percent iron, these materials being combined with approximately ten (10%) percent of vanadium pentoxide. However, neither the materials them- 15 selves nor the percentages given are particularly critical-the invention being concerned chiefly with the use of vanadium pentoxide as a bonding material in magnets of the pressed or pressed and sintered type.

What is claimed is:

1. A magnet material comprising magnetic particles and vanadium pentoxide.

2. A magnet material comprising magnetic particles bound together by vanadium pentoxide. 2 ous elements entering into the composition of the.

3. A magnet comprising finely divided metal or the iron' group bonded together by vanadium pentoxide'.

4. The method of producing a magnet which comprises adding a quantity of vanadium pen- 

